Pin STB header files at working versions.

CMakeLists.txt

@@ -110,16 +110,6 @@ ExternalProject_Add(Json
 )
 set(JSON_INCLUDE_DIR "${CMAKE_BINARY_DIR}/json/src/Json/src")
 
-# stb
-ExternalProject_Add(STB
-  PREFIX stb
-  GIT_REPOSITORY https://github.com/nothings/stb
-  CONFIGURE_COMMAND ${CMAKE_COMMAND} -E echo "Skipping STB configure step."
-  BUILD_COMMAND ${CMAKE_COMMAND} -E echo "Skipping STB build step."
-  INSTALL_COMMAND ${CMAKE_COMMAND} -E echo "Skipping STB install step."
-)
-set(STB_INCLUDE_DIR "${CMAKE_BINARY_DIR}/stb/src/STB")
-
 # cppcodec
 ExternalProject_Add(CPPCodec
   PREFIX cppcodec
@@ -225,7 +215,6 @@ add_dependencies(libFBX2glTF
   MathFu
   FiFoMap
   Json
-  STB
   CPPCodec
   Fmt
 )
@@ -268,6 +257,7 @@ endif()
 
 target_include_directories(libFBX2glTF PUBLIC
   ${CMAKE_CURRENT_SOURCE_DIR}/src
+  "third_party/stb"
 )
 target_include_directories(libFBX2glTF SYSTEM PUBLIC
   Iconv::Iconv
@@ -276,7 +266,6 @@ target_include_directories(libFBX2glTF SYSTEM PUBLIC
   ${MATHFU_INCLUDE_DIRS}
   ${FIFO_MAP_INCLUDE_DIR}
   ${JSON_INCLUDE_DIR}
-  ${STB_INCLUDE_DIR}
   ${CPPCODEC_INCLUDE_DIR}
   ${FMT_INCLUDE_DIR}
   ${LIBXML2_INCLUDE_DIR}